<https://japanlensassociation.com/how-to-identify-pentax-super-takumar-55mm-f1-8-model/#article>
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"Pentax Super-Takumar 55mm F1.8 機種の見分け方と整備方法"
<https://japanlensassociation.com/how-to-identify-pentax-super-takumar-55mm-f1-8-model/>